Back in 2009, EirGrid was exploring the business case for interconnectors. A third 500MW undersea cable to carry electricity between the Island of Ireland and Great Britain “is economically attractive by 2020, and more so in 2025”, was one of the key takeaways of its report. Sixteen years later, in April 2025, the 500MW Greenlink Interconnector was commissioned in Wexford, where the cable from Pembrokeshire, Wales, makes landfall. It has “quickly become the most utilised SEM interconnector” according to the Commission for the Regulation of Utilities, referring to the Single Electricity Market (SEM), in which the Republic of Ireland and…

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